Andrews and Arnold are brilliant https://www.aa.net.uk/. If there's any problems someone picks up the phone on the 2nd or 3rd ring and several times they have rung me immediately after I sent an e-mail. As they are primarily B2B, their support is excellent and there are a lot fewer miscommunications with OpenReach. Go to their website and enter your postcode which will show you exactly what type of broadband is available in your area.